Metal Frame Antenna Switching for Free-Space and Handheld Efficiency
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Solution Overview
Problem
Metal frame antennas in electronic devices suffer from reduced radiation efficiency when touched by a human body, as the human body absorbs antenna radiation, particularly in handheld scenarios, while maintaining good radiation performance in free space environments.
Innovation Solution
Designing the metal frame as an antenna with slots on both the side and bottom frames, allowing separate feeding based on scene conditions to switch between portrait and landscape modes, using tuning switches and ground points to optimize radiation efficiency in both free space and handheld scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna structure is simplified for single-mode operation, then device complexity is reduced, but adaptability to different usage scenarios deteriorates
Solution Approach 1:
The patent introduces dynamic switching capability through tuning switches that can change the antenna's electrical characteristics in real-time. This dynamic adjustment allows the simple metal frame structure to adapt to different usage scenarios (free space vs. handheld) without requiring complex multi-antenna systems.
Solution Approach 2:
The metal frame antenna is designed as a universal structure that can operate in both portrait and landscape modes, as well as in free space and handheld scenarios. The tuning switches enable this single structure to fulfill multiple functions, reducing overall device complexity while maintaining high adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures high free space radiation efficiency in portrait mode and high handheld radiation efficiency in landscape mode, balancing performance in different usage scenarios without interference.
Implementation Method 1
US20180026361A1 discloses an antenna system with dynamic impedance matching for wireless communication
Implementation Method 2
The feeder 23 can be configured to selectively connect the feed point S or the feed point T
Implementation Method 3
the side metal frame and the bottom metal frame are separately fed based on different scenes, so as to switch between a portrait mode and a landscape mode
Data Source
Figure 1
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Figure 2B
AI summary
An antenna apparatus is provided. The antenna apparatus is formed by using a metal frame of an electronic device. Slots are arranged on both a bottom metal frame and a side metal frame to balance free space radiation efficiency and handheld radiation efficiency. In a free space scene, a portrait mode of an antenna is strong, and free space radiation efficiency is good. When an electronic device is held in the hand, a lateral mode of the antenna is strong, and handheld radiation efficiency is good.